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Preparation method of three-dimensional oxidized graphene based carbon dioxide adsorbent

A graphene-based carbon dioxide and adsorbent technology, applied in chemical instruments and methods, separation methods, and other chemical processes, can solve the problems of undeveloped three-dimensional pores, low adsorption rate, and low capacity, and achieve adsorption selectivity and Increased adsorption capacity, improved adsorption performance, and excellent performance

Active Publication Date: 2018-11-06
FUJIAN UNIV OF TECH
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Problems solved by technology

[0006] As mentioned above, the three-dimensional graphene-based materials currently being researched mainly have the following methods: ① first construct a three-dimensional frame, and then construct graphene materials on top of the frame, although the characteristics of the huge specific surface area of ​​graphene can be maintained, but its to CO 2 The adsorption can only be physical adsorption, and better CO can only be obtained under high pressure or low temperature. 2 Adsorption effect
② Directly modify the surface of graphene oxide with amine groups, and increase the CO by increasing the amine groups on the surface of the material. 2 However, since the surface of graphene oxide has fewer groups directly bound to the amine compound, the CO of the prepared adsorbent 2 The capacity is not very high (<2mmol / g), and its three-dimensional pores are not developed, and the adsorption rate is low

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  • Preparation method of three-dimensional oxidized graphene based carbon dioxide adsorbent
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  • Preparation method of three-dimensional oxidized graphene based carbon dioxide adsorbent

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preparation example Construction

[0022] A preparation method of a three-dimensional graphene oxide-based carbon dioxide adsorbent, comprising the following steps:

[0023] Step 1. Weigh a certain amount of commercial graphene oxide, completely and homogeneously disperse it in a triethyl orthoacetate solution at a concentration of 3-5 mg / 1ml, and ultrasonically treat it for 10-30 minutes, and the obtained solution is ready for use;

[0024] Step 2. Add toluenesulfonic acid whose mass is 0.02 times that of graphene oxide to the solution to be used, place it in a hydrothermal reaction kettle, react at 403K for 36-48 hours, then cool to room temperature, and centrifuge to separate out the solution sediment;

[0025] Step 3. Disperse the precipitate obtained in step 2 in deionized water at a concentration of 1 to 4 mg / 1ml, ultrasonically treat it for 10 to 30 minutes, add EDC whose mass is 2 to 3 times that of graphene oxide, stir evenly, and then Add HOBT whose mass is 2 to 3 times that of graphene oxide, oscill...

Embodiment 1

[0030] Take 2g of commercial graphene oxide, completely homogeneously disperse it in 400ml of triethyl orthoacetate solution, ultrasonically treat the solution for 20min, then add 0.04g of toluenesulfonic acid, put it in a hydrothermal reaction kettle, and react under the condition of 403K After 48 hours, cool to room temperature, and centrifuge to separate the precipitate A in the solution; disperse the precipitate A in 500ml deionized water, after ultrasonic treatment for 20min, add 6g EDC, stir evenly, then add 6g HOBT, shake and vigorously Stir until completely dissolved, and after 24 hours of ultrasonic treatment, centrifuge to separate precipitate B; disperse precipitate B in 500ml of methanol solution, add 20g of tetraethylenepentamine, and after 12 hours of ultrasonic treatment, centrifuge to separate precipitate C; Precipitate C was dispersed in 500ml of deionized water, ultrasonically treated for 20 minutes, and vacuum freeze-dried for 24 hours. The obtained precipita...

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Abstract

The invention discloses a preparation method of a three-dimensional oxidized graphene based carbon dioxide adsorbent. Oxidized graphene and a long-chain amido compound are used as raw materials, a porous solid adsorbent with a three-dimensional porous structure is prepared under the assistance effect of ultrasonic waves, the three-dimensional porous structure makes the adsorption, desorption and diffusion resistance reduced, the adsorption and desorption rate is improved, meanwhile amido groups exist on the inner surfaces of pores, active CO2 adsorption point positions (amido groups) of the inner surface of the pores of an adsorbing material are increased, and the adsorptive selectivity and adsorbing capacity of adsorbing material to CO2 are greatly improved. The preparation process is simple, the adsorbent with excellent preparation performance can be prepared without advanced three-dimensional framework establishment and material surface modification, the preparation difficulty is reduced, and the adsorption and desorption performance is also improved.

Description

technical field [0001] The invention relates to a carbon dioxide adsorbent, in particular to a preparation method of a three-dimensional graphene oxide-based carbon dioxide adsorbent. Background technique [0002] carbon dioxide (CO 2 ) is the main greenhouse gas, and its volume fraction in combustion flue gas is about 10%–15%. CO 2 A large amount of emissions have an important impact on our living environment and human health. Therefore, how to effectively control and reduce CO 2 The emission of carbon dioxide is one of the severe challenges that people face in the 21st century. CO 2 The capture and storage (carbondioxide capture and storage, CCS) is to reduce CO 2 One of the important technologies of emission. At present, monoethanolamine aqueous solution (30% mass fraction) is commonly used in industry to capture CO 2 , but the absorbent for CO 2 The capture amount of the absorbent is only 7% (mass fraction), and the absorbent has serious equipment corrosion, hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02
CPCB01D53/02B01D2257/504B01J20/20Y02C20/40
Inventor 刘亚敏喻晓静
Owner FUJIAN UNIV OF TECH
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